A group of former intelligence experts and defense officials have signed a letter requesting that an independent investigation should begin regarding the email hacking that took place during the presidential election and campaigns of 2016.

In the letter, released by Buzzfeed News, the group points out that the electronic hacking crossed a line and could potentially “normalize future interference,” if not addressed. Through the findings, the letter suggests that preventative measures could also be formulated to ensure this level of hacking doesn’t happen again.

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It also urges Congress to make the decision soon because “anything less than a swift investigation will leave us vulnerable for another attack … .”

Overall, the Democratic National Committee and the Democratic Congressional Campaign Committee, as well as John Podesta, were affected by the hacking that released personal and professional information over the course of the election season.

The Office of the Director of National Intelligence, ODNI, found that the Russian government was responsible for the email hacks, writes the letter. ODNI also confirmed that “various states” had their elections systems scanned by servers owner by a Russian company. In addition to the email hacks and server scanning, the ODNI says it believes that efforts by a Russian entity to push fake election-related news took place as well.

While several U.S. intelligence agencies agree that the Russia government is indeed responsible for the electronic hacking, the group says, the independent investigation would shed light on the issue in a bipartisan way and address the doubts some have expressed regarding Russia’s involvement.

Those who signed the letter include Madeleine Albright the 64th secretary of state, Michael Morell the former acting director and deputy director for the Central Intelligence Agency, Leon Panette the former secretary of defense and Paul Rosenzweig, the former deputy assistant secretary for police with the Department of Homeland Security as well as many other notable names.